U.S. Air Force Senior Airman Charles Rutledge, an aircraft propulsion system journeyman with the 509th Aircraft Maintenance Squadron, examines components of a B-2 Spirit engine at Whiteman Air Force Base, Mo., July 27, 2017. On average, it takes about four hours to complete an engine inspection that consists of 300 items. (U.S. Air Force photo/Staff Sgt. Danielle Quilla)